--- /dev/null
+/*
+ * LM4857 AMP driver
+ *
+ * Copyright 2007 Wolfson Microelectronics PLC.
+ * Author: Graeme Gregory
+ * graeme.gregory@wolfsonmicro.com
+ * Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+struct lm4857 {
+ struct regmap *regmap;
+ uint8_t mode;
+};
+
+static const struct reg_default lm4857_default_regs[] = {
+ { 0x0, 0x00 },
+ { 0x1, 0x00 },
+ { 0x2, 0x00 },
+ { 0x3, 0x00 },
+};
+
+/* The register offsets in the cache array */
+#define LM4857_MVOL 0
+#define LM4857_LVOL 1
+#define LM4857_RVOL 2
+#define LM4857_CTRL 3
+
+/* the shifts required to set these bits */
+#define LM4857_3D 5
+#define LM4857_WAKEUP 5
+#define LM4857_EPGAIN 4
+
+static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+ struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+
+ ucontrol->value.integer.value[0] = lm4857->mode;
+
+ return 0;
+}
+
+static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+ struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+ uint8_t value = ucontrol->value.integer.value[0];
+
+ lm4857->mode = value;
+
+ if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
+ regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, value + 6);
+
+ return 1;
+}
+
+static int lm4857_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F,
+ lm4857->mode + 6);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, 0);
+ break;
+ default:
+ break;
+ }
+
+ codec->dapm.bias_level = level;
+
+ return 0;
+}
+
+static const char *lm4857_mode[] = {
+ "Earpiece",
+ "Loudspeaker",
+ "Loudspeaker + Headphone",
+ "Headphone",
+};
+
+static SOC_ENUM_SINGLE_EXT_DECL(lm4857_mode_enum, lm4857_mode);
+
+static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
+ SND_SOC_DAPM_INPUT("IN"),
+
+ SND_SOC_DAPM_OUTPUT("LS"),
+ SND_SOC_DAPM_OUTPUT("HP"),
+ SND_SOC_DAPM_OUTPUT("EP"),
+};
+
+static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
+static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
+
+static const struct snd_kcontrol_new lm4857_controls[] = {
+ SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
+ stereo_tlv),
+ SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
+ stereo_tlv),
+ SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
+ mono_tlv),
+ SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
+ SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
+ SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
+ LM4857_WAKEUP, 1, 0),
+ SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
+ LM4857_EPGAIN, 1, 0),
+
+ SOC_ENUM_EXT("Mode", lm4857_mode_enum,
+ lm4857_get_mode, lm4857_set_mode),
+};
+
+/* There is a demux between the input signal and the output signals.
+ * Currently there is no easy way to model it in ASoC and since it does not make
+ * much of a difference in practice simply connect the input direclty to the
+ * outputs. */
+static const struct snd_soc_dapm_route lm4857_routes[] = {
+ {"LS", NULL, "IN"},
+ {"HP", NULL, "IN"},
+ {"EP", NULL, "IN"},
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
+ .set_bias_level = lm4857_set_bias_level,
+
+ .controls = lm4857_controls,
+ .num_controls = ARRAY_SIZE(lm4857_controls),
+ .dapm_widgets = lm4857_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(lm4857_dapm_widgets),
+ .dapm_routes = lm4857_routes,
+ .num_dapm_routes = ARRAY_SIZE(lm4857_routes),
+};
+
+static const struct regmap_config lm4857_regmap_config = {
+ .val_bits = 6,
+ .reg_bits = 2,
+
+ .max_register = LM4857_CTRL,
+
+ .cache_type = REGCACHE_FLAT,
+ .reg_defaults = lm4857_default_regs,
+ .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs),
+};
+
+static int lm4857_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct lm4857 *lm4857;
+
+ lm4857 = devm_kzalloc(&i2c->dev, sizeof(*lm4857), GFP_KERNEL);
+ if (!lm4857)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, lm4857);
+
+ lm4857->regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
+ if (IS_ERR(lm4857->regmap))
+ return PTR_ERR(lm4857->regmap);
+
+ return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
+}
+
+static int lm4857_i2c_remove(struct i2c_client *i2c)
+{
+ snd_soc_unregister_codec(&i2c->dev);
+ return 0;
+}
+
+static const struct i2c_device_id lm4857_i2c_id[] = {
+ { "lm4857", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
+
+static struct i2c_driver lm4857_i2c_driver = {
+ .driver = {
+ .name = "lm4857",
+ .owner = THIS_MODULE,
+ },
+ .probe = lm4857_i2c_probe,
+ .remove = lm4857_i2c_remove,
+ .id_table = lm4857_i2c_id,
+};
+
+module_i2c_driver(lm4857_i2c_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("LM4857 amplifier driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff